454 Mac far lane. — Observations on Pitchered 
expanded in its leaf-sheath, as in Iris and Sarracenia , then 
fuses along the middle region, so as in some cases to entirely 
or partially obliterate the free faces, and again opens out 
in its terminal portion. Now both in Iris and Phormium 
the most posterior vascular bundles that traverse the free 
faces of the leaf-sheath are prolonged straight up to the 
organic apex, thus demarcating the wide extent of fusion 
that has occurred in the upper leaf-faces. In seeking there- 
fore for ‘ evidence from external form 5 solely or chiefly, there 
is the danger, we believe, of the mark being overreached. It 
is further suggested that I regard the leaf of Iris as a com- 
pound one. No such statement has ever been made by me, 
though I feel I was quite justified in comparing the fused 
laminar faces of /rA-leaf with the similarly but more perfectly 
fused leaflet-faces of Sarracenia. 
I can see no relation between the phyllode of an Acacia and 
the median flap of Sarracenia , since the latter is not a flattened 
petiole, but a median process growing out from a rounded 
and well-developed mid-rib. To regard it, particularly in 
view of its affinity to Heliamphora , as a fusion of laminar 
faces, rather than as ‘ a phyllodineous flap,’ appears to be the 
more simple and natural explanation. 
As regards the lids of Sarracenia and lips of Darlingtonia , 
I must still view these as leaflets, and Mr. Aldrich Pennock 
brought me during the past summer an interesting con- 
firmatory specimen in a pitcher of .S. purpurea . This showed 
(Fig. 44) a sharp transverse fusion of the vascular bundles 
across the mouth of the pitcher posteriorly, and a mid -rib 
prolonged from this and ending in a minute point, the organic 
leaf-apex. From either side sprang two expanded lobes that 
were supplied with vascular bundles from the mid-rib. 
Goebel’s beautiful illustrations of Darlingtonia confirm this ; 
though we must take exception to the statement that he 
makes regarding these (p. 84), ‘ dieselben als Fiederblattchen 
zu betrachten liegt wohl kein Grund vor. Es ist eben eine 
Teilung del* Blattspitze, welche dieselbe zu einem noch 
auffallenderen Anhangsel des Schlauches macht, als es der 
